SU920540A1 - Device for extremum moment determination - Google Patents

Description

. I. : The invention relates to measuring and computing techniques and can be used in the study of random electrical sigma signals. A device for determining the extremum moments is known, which is based on a comparison of two sequences of the signal under investigation, containing an analog storage unit, a comparator, a pulse generator, a pulse distributor, Koto outputs are connected to the control inputs g of writing and reading analogue recording unit 1 The disadvantages of the known device are the low accuracy due to the multi-stage (four-stroke mode of operation), and the limited frequency and dynamic range. The closest in technical essence to the invention is a device for determining moments of an extrem, comprising an analog storage unit, a pulse generator, a pulsator, a comparator, a strobe pulse form D-trigger, a delay line, a feedback node and a display unit 2 The disadvantage is also a limited frequency range and low noise immunity, due to the fact that with a small sampling period and correspondingly high sensitivity of the comparator, the interfering effect of noise increases. Contained in the signal. The purpose of the invention is to expand the frequency range, to increase accuracy and noise immunity. The goal is achieved by the device for determining the extremum moments, which contains a square pulse generator, a push-pull pulse distributor, the direct and inverse outputs of which are connected respectively to the first and second control inputs of the analog storage unit, the input and output of which are connected. with the corresponding inputs of the comparator, the strobe pulse shaper connected to the inverse output of the push-pull pulse distributor and the display unit additionally contain a summing element, a frequency divider, a selector, a shaper of reset pulses and an inverter connected to the output of the comparator, the output of the square impulse generator The pin is connected to the first input of the summing element and to the input of a frequency splitter, the second input of which is to the input of the device, and the output is connected to the input of the analog memory About the unit, the output of the frequency divider is connected to the input of a two-stroke pulse distributor and to the first input of the pulse shaper. A reset, the first input of which is connected to the inverse output of the push-pull pulse distributor, the output of the comparator is connected to the first inputs of the display unit and the selector. with the second inputs of the display unit, and the selector, the clock input of which is connected to the output of the strobe pulse former, and the setup input - with the output of the reset pulse former, the first output of the selector with edinon a control input of a two-stroke pulse distributor and the second selector output - to an input of the display synchronization unit .. Fig. 1 is a block diagram of the device; in fig. 2 - time diagrams of work. The device contains a summing element 1, an analog storage unit 2, a comparator 3, a generator of 4 rectangular pulses, a frequency divider 5., a push-pull pulse distributor 6, a driver for reset pulses 7, a driver for strobe pulses 8, a selector 9, an inverter 10, a display unit 11 In addition, in FIG. 1 shows the execution of individual units of the device. Analog storage unit 2 contains a key 12, a storage capacitor 13, a buffer cascade 1, a key 15. Pulse distributor 6 contains AND 16 and HE 17 elements, reset pulse shaper 7 contains delay element 18, HE 19 and 20, S O4 elements. element AND-NO 21, selector 9 contains elements AND 22 and 23, R5 triggers 2 and 25, delay element 26, element AND-NOT 27, and element 28. Display unit 11 contains a synchronized R5 trigger 29, pulse shapers 30 and .31 The device operates in the adaptive mode according to the principle of fixing the change of the sign of the difference between the gated current and the previous recorded values of the signals. The result of the comparison at the time of the extremum is generated in one to two measurement cycles. With the help of summing element 1, the input signal is superimposed variable, which is equivalent to the span of DE, which exceeds the span of interference 2 UD. In case of equality of DE 2Ut, the device operates with extreme precision. The duration of the sampled cycle of the memorized flag is determined by the duration of the positive half-cycle of the pulse at the output of frequency divider 5. However, sampling is not carried out in each cycle, but only when the condition is fulfilled. (O. Otherwise, there are no control pulses at the control input of the pulse distributor 6 (moments 1-3, fig. 2f). Failure to fulfill the specified condition (1). Is detected by the comparator 3, which, at low dooh during the gating time, more than once. This information from the output of the comparator 3 and from the output of the inverter 10 is fed to the direct and inverse information inputs of the selector 9, which produces control and timing signals at the respective outputs, thus coordinating the operation of the distributor of pulses 6 and indication locator 11. With a short pulse (Fig. 2d) coming from the output of the imaging unit 7 in each step, the selector 9 is set to this position (before the strobe pulse arrives from the output of the imaging unit 8) when its controller is in position 1 (Fig. 2g ), and synchronizing in position O of FIG. 2 g). The installation pulse is generated by the shaper 7 by two signals arriving at its inputs: at the first output of the divider 5 (Fig. 2c), and at the second - from the second control output of the COS distributor b (Fig. 2c). In this case, the signal from the output of the delay element 18 (Fig. 2c) provides for the formation of a short reset-pulse for the time of its delay (Fig. 2d). After the impact of the pulse-pulse on the clock input of the selector 9 post. The strobe pulse emitted from the output of the imaging unit 8 (Fig. 2e) If on the interval of the strobe pulse the comparator 3 operates 2 or more times, then from its second triggering the control output of the selector 9 is set to O (moments 1 - Fig. 2d), blocking the generation of the useful signal until relation (1) is fulfilled. At the same time, the synchronizing output of the selector 9 (Fig. 2g) also does not generate a pulse, if during the leading edge delay, the delay element 26 was set to element 27 in O. If in each measurement cycle relation (1) is fulfilled, then At the same time, the output of the selector 9 remains in position 1, and the synchronizing output in each cycle produces a pulse allowing the block 11 to analyze the incoming information. When the sign of the derivative changes, the trigger 29 triggers. If it is necessary to measure the extreme value of the input signal., The indication pulses are used as measurement trigger signals.

The measuring device is taken at the output of the buffer stage 1 of the block-2.

Use and implementation of adaptive mode of operation, execution of Q

On the basis of the integrated circuit technology, the proposed extremum determiner differs from the known ones, its frequency range is expanded, the error in determining the extremum is reduced due to a 2-fold reduction in the differentiation process, eliminating the effect on the accuracy of the installation sampling frequency, and reducing the number of analog precision j onnyh elements.

Claims An apparatus for determining extremum moments comprising a generator

torus, the clock input of which is connected to the output of the strobe pulse former, and the setup input - with the output of the reset pulse shaper.

the control input of the push-pull pulse distributor; and the second output of the selector, with the synchronization input of the display unit.

I.

Sources of information taken into account in the examination

1. Measurement, control, automation. 1977, No. J (lO, c- 2k.

fr

2. USSR author's certificate on application no. 2b89 85/2,

cl. G 01 R 19 / OA, 1978. rectangular pulses, push-pull pulse distributor, the direct and inverse outputs of which are connected respectively to the first and second control inputs of the analog storage unit, the input and output of which are connected to the corresponding inputs of the comparator, a pulse generator, connected, to the inverse output of the push-pull pulse distributor, and the display unit, in which, in order to expand the frequency range, increase the accuracy and noise immunity, the device additionally holds the summing element, the frequency divider, the selector, the reset pulse shaper and the inverter connected to the comparator output, the output of the square pulse generator is connected to the input of the frequency divider and the first input of the summing element whose second input is the input of the device and the output is connected to the input analog storage unit, the output of the frequency divider is connected to the input of the push-pull pulse distributor and to the first input of the reset pulse shaper, the second input of which is connected to the inverse output m push-pull pulse distributor, the comparator output is connected to the first inputs of the display unit and the selector output of the inverter is connected to the second inputs of the display unit and the first selector output of the selector is connected to

Claims (1)

claims A device for determining the moments of extremum, containing a generator, input and output indication, measure-35 measurement of proI, rectangular pulses, a push-pull pulse distributor, the direct and inverse outputs of which are connected respectively to the first and second up ^and equal inputs of the analog storage unit, the input and output which are connected to the corresponding inputs of the comparator, a strobe driver, connected to the inverse output of the push-pull pulse distributor, and an indication unit , characterized in that, in order to expand the frequency range, improve accuracy and noise immunity, the device further comprises a summing element, a frequency divider, a selector, a reset pulse generator and an inverter connected to the output of the comparator, the output of the rectangular pulse generator is connected to the input of the divider frequency and with the first input of the summing element, the second input of which is the input of the device, and the output is connected to the input of the analog storage unit, the output of the frequency divider is connected to the input of two a clock pulse distributor and to the first input of the reset pulse shaper, the second input of which is connected to the inverse output of the push-pull pulse distributor, the comparator output is connected to the first inputs of the display unit and selector, the inverter output is connected to the second inputs of the display unit and selector, the clock input of which is connected to the output of the driver of the strobe pulse, and the installation input with the output of the driver of the reset pulse, the first output of the selector is connected to the control input of the push-pull distributor imp pulse wave I, and the second selector - with the synchronization input of the display unit.